Editing Yin and yang (section)

=== ''Taijitu'' ===
{{Main|Taijitu}}
[[File:Yin and Yang symbol.svg|thumb|The ''[[taijitu]]'']]

The principle of yin and yang is represented by the ''taijitu'' (literally "diagram of the [[Supreme Ultimate]]"). The term is commonly used to mean the simple "divided circle" form, but may refer to any of several schematic diagrams representing these principles, such as the [[swastika]], common to Hinduism, Buddhism, and Jainism. Similar symbols have also appeared in other cultures, such as in [[Celtic art]] and [[Notitia Dignitatum#Depictions|Roman shield markings]].<ref name="Giovanni Monastra (2000)">Giovanni Monastra: "{{usurped|1=[https://web.archive.org/web/20110925054740/http://www.estovest.net/tradizione/yinyang_en.html The "Yin–Yang" among the Insignia of the Roman Empire?]}}," "Sophia," Vol. 6, No. 2 (2000)</ref><ref name="Late Roman Shield Patterns">{{cite web |url=http://www.ne.jp/asahi/luke/ueda-sarson/MagisterPeditum.html |title=Late Roman Shield Patterns – Magister Peditum |work=www.ne.jp}}</ref><ref name="Helmut Nickel (1992), 146, 5">Helmut Nickel: "The Dragon and the Pearl," ''Metropolitan Museum Journal,'' Vol. 26 (1991), p. 146, fn. 5</ref>

In this symbol the two teardrops swirl to represent the conversion of yin to yang and yang to yin. This is seen when a ball is thrown into the air with a yang velocity then converts to a yin velocity to fall back to earth. The two teardrops are opposite in direction to each other to show that as one increases the other decreases. The dot of the opposite field in the tear drop shows that there is always yin within yang and always yang within yin.<ref>{{Cite book |last=Hughes |first=Kevin |title=Introduction to the Theory of Yin-Yang |publisher=Independent |year=2020 |isbn=979-8-6678-6786-9 |location= |pages=}}{{page needed|date=October 2022}}</ref>